As of March 28th, doHTML in the main forums has been disabled.
Don't let this deter you from joining, however. The only reason that this has happened is because a close friend of mine got her site hacked the other day, and it was deleted. She believes it's because she had doHTML on and someone registered and hacked her site. In the communication/game/advertisement boards, it's still on, but in the regular boards, things will look a little plainer.